Perhaps you should try some spelling variations:
doanh tang » doanh sang, doanh tong, doanh thanh
hoc sach » hoc sinh, hoc cac, hoc anh
tang cua » mang cua, hang cua, tang luan
va doanh » van doanh, vay doanh, va danh
cac tuc » cac toc, cac tac, cac nuoc
cua tre » cua te, cuu tre, cua triet
ky danh » ky dang
hieu ve » hieu va, hieu van
ha hoi » hoa hoi, ha noi, xa hoi
cac tu » cac thu, cach tu, cac du
ky anh » ly anh, ty anh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((ky danh) OR (ky anh)) ha hoi. hieu ve ((cac tuc) or (cac tu)) va doanh tang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky danh) OR (ky anh)) ha hoi. hieu ve ((cac tuc) OR (cac tu)) va doanh tang cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ky danh) OR (ky anh)) ha hoi. hieu ve ((cac tuc) or (cac tu)) va doanh tang cua tre*".